ucon#68: Derived units and deterministic naming

[withtwoemms]

closes #68

[codecov-commenter]

Codecov Report

❌ Patch coverage is 80.00000% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.69%. Comparing base (a689a40) to head (bbb083c).

Files with missing lines	Patch %	Lines
ucon/core.py	79.15%	39 Missing and 15 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   91.08%   84.69%   -6.40%     
==========================================
  Files           5        5              
  Lines         415      588     +173     
  Branches       54       91      +37     
==========================================
+ Hits          378      498     +120     
- Misses         22       62      +40     
- Partials       15       28      +13     

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[withtwoemms]

closing in favor of #81